The Electric Field in a Region Around the Origin Is

question 37

Multiple Choice

The electric field in a region around the origin is given by where C is a constant. The equipotential surfaces are:

• A) concentric cylinders with axes along the z axis
• B) concentric cylinders with axes along the x axis
• C) concentric spheres centered at the origin
• D) planes parallel to the xy plane
• E) planes parallel to the yz plane

---

Definitions:

Zeitgebers

External or environmental cues, such as light and temperature, that help regulate biological rhythms, including the sleep-wake cycle.

Melatonin

A hormone produced by the pineal gland that regulates sleep and wakefulness.

Secreted

Refers to the process by which substances are produced and discharged from cells or glands, often into the bloodstream or external environment.

Pineal Gland

A small endocrine gland in the brain that produces melatonin, a hormone that regulates sleep-wake cycles.